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This should converge ....

https://www.circuitlab.com/circuit/ax9y52/flusher-02/

but get's stuck as V(diff) decays towards zero at around 52%.

:(

Fixed now (along with a big class of other convergence issues -- blog post likely later this week!)

Runs quite speedily if you make timestep=20m.

Thanks Mike,

Yup, that works well now so I've removed the comments about the convergence problem in that and all the related circuits (flusher 04, flusher5, flusher6, flusher7).

(I've left in the comment about the 555 output swing 5V limit.)

:)